Stop watch



FIG. 1 is a front elevational view of a stop watch showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereto;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a stop watch, as shown and described. 